feat: rework search as a block

[laurelfulford]

All Submissions:

• Have you followed the Newspack Contributing guideline?
• Does your code follow the WordPress' coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Closes # .

How to test the changes in this Pull Request:

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully ran tests with your changes locally?

[laurelfulford]

@thomasguillot I still think we should do this to make the search easier to add, but the PR probably does need a fresh start once we start working on this again! 🙂

[thomasguillot]

@laurelfulford Oh no, so sorry, I didn't mean to close this PR. I think it happened when I deleted the master branch 🤦‍♂️. I'll create a new Issue and add a reference to this PR.

[laurelfulford]

@thomasguillot It's all good -- I thought the super-old PR might've been driving you nuts 😆 I'm not sure if much was salvageable as is. Thanks for creating a new issue!